tan choate



4 Sheets-Shet 1.

(No Model.) S. F. VAN GHOATE.

ELECTRIC ARC LAMP. No. 309,012. Patented Dec. 9, 1884.

F15cl- \NiTNESSESl l sngixmgfgmzt .M Nw ./CZ/' 0a 6.

4 Sheets Sheet 2.

(No Model.)

s. F. VAN OHOATB.

ELECTRIC ARC LAMP.

Patented Dec. 9. 1884.

INVENTEIFH 8F Va/zC/wate WITNESSES N. PETERS. Phulo-Lllhuyzmphnr,Waahlngtom D. c.

4 Sheets Sheet 3.

S. F.- VAN GHOATE -116 Model.)

ELECTRIC ARC LAMP.

Patented Dec. 9, 1884.

IN\/E NT CIR SI. Van C/ZOOLZE N. PETERS. Pnmo-umn m mr. Vin/Mullen. D.c.

(No Model.) 4 Sheets-Sheet 4.

S.-F. VAN CHOATE.

ELECTRIC ARC LAMP.

Patented Dec. 9, 1884.

Fig/.4

INVENTUH:

7 \lli .lU-I- I 2 iv v f OAW M 7%. 2 a m? w a s & w W A l F v 3 v m Q TM lJNiTED STATES PATENT Orrren'.

SILVANUS F. VAN GHOATE, OF NEW YORK, N. Y.

ELECTRIC-ARC LAMP.

ZEFEUIFICATIQN forming part of Letters Patent No. 309,012, datedDecember 9, 1884. Application filed June 24, 1861. (No model.)

T0 at whom, it may concern:

Be it known that I, S. F. VAN OIIOATE, a citizen of the United States,residing at New York, in the countyof New York, and State of NewYork,have invented certain new and useful Improvements in Electric Lamps, ofwhich the following is a specification.

My invention relates to that class of electric lamps known as arc lamps,in which the conducting sticks or pencils are placed end to end, and fedtoward one another as they consume.

My invention consists in certain novel devices for feeding both carbonstoward one another and for determining the length of are.

My invention consists, further, in certain novel devices for supportingthe various parts of the lamp, and for securing a reflecting-hood to theglobe surrounding the light,whereby the lamp described in my Patent No.268,155 is adapted for use with electric-are lights in which the carbonsare placed end to end.

My invention finally consists in certain details of construction, whichwill be specified in the claims.

The features of construction relating to the reflector and the devicesfor making connection to the lamp are also applicable to incandescentelectric lamps, as will readily appear from the annexed description.

In the accompanying drawings, Figure l is an elevation of the lamp. Fig.2 is a vertical section of the lower part of the lamp, showing thedetails of construction relating to the regulating and feeding mechanismand the devices for supporting the same and conveying the current to thelight. Fig. 3 is a detail section of the upper part of the lamp, showingthe construction of the hood and reflector and the means employed forsecuring the various parts together. Fig. 4 is a detail viewillustrating the path of the current through the lamp, and showing,also, a modified arrangement of the electromagnetic devices for controlling the carbons. Fig. 5 is a bottom view of the casing andsupporting devices. Fig. 6 is a top view showing the devices for holdingand clamping the lower carbon. Fig. 7 is a vertical section of devicesto be employed for making electrical connection between the lamp and themain eonductors. Fig. Sis a section of the lower part of a supportingpost or bracket, showing devices that may be employed for cutting offthe current when the lamp is lowered in its support or bracket forrepair or removal or for the insertion of new carbons. Fig. 9 is adetail "iew of the spring clamp.

Referring to Fig. 2 of the drawings, P represents a hollowsupporting-post, upon the top of which an inclosing globe for the lightis supported in the manner set forth in my patent above referred to, orin any other suitable manner.

13 is a tube of metal fixed in the upper part of the post and acting asa support and guide for the cylindrical movable case A, of metal,containing the mechanism of the lamp proper.

O is a stirrup or bracket secured to the lower part of the case by meansof screws or bolts, (1, while 1) represents the top of a supporting rodor tang depending within the post to a point where it may be reachedfrom a door or opening in the post below. This rod is secured in across-piece, b, by means of a nut, c, as shown, and serves to hold thelamp proper in an elevated position or to lower the same to the level ofthe door or opening in the manner described in my application abovenamed.

E is a hollow cylinder, of wood or other insulating materiahlittingclosely within and secured to the metallic tube A. This cylinder servesas a means of attachment and support for the various mechanisms, andalso as aninsulation between the various parts. lVithin this cylinderare fixed in any suitable manner two spools, F F the lower one of woodor bone, rubber, or other non-magnetic material, such as brass, and theupper of soft iron, which hold two coils or helices of insulated wire,the upper coil in the circuit with the carbons and acting as theregulating-coil, and the lower in a derived circuit around the carbons.These spools are bored centrally for the passage of the lower carbon andholder. A hollow cylinder, ol'brass or other metal, is fast cued withinthe lower spool, and is screwed into the lower end of the iron spool, soas to hold the two spools in line and lirmly together. It serves also asa guide for the 1101- low metallic tube within which the lower car bonis supported, and through which it is fed upward by the devices to bepresently described.

G- is a circular armature of iron encircling the tube of copper or othernonmagnetic metal and fastened thereto. It is arranged to be attractedby the upper metallic spool ofiron, to whose upper face is secured apiece of felt or other material which serves to prevent the armaturefrom sticking and to deaden the sound or click of the armature when itis brought forcibly down in contact with the head of the spool. The edgeof the armature is slightly beveled, for the purpose of impartingmovement to devices bearing against the armature at that point, whichserve to release and to hold the upper carbon. upward movement of thearmature is controlled by an adjustable screw tap or sleeve, H, whichincloses the tubef, and is provided upon its exterior with ascrew-thread for engagement with a serew-thread upon the interior of aboss or sleeve projecting downward from a cap-plate, 1 The sleeve isprovided with a milled head, whereby it may be adjusted Verti :ally. Thehollow tube f. which carries the lower carbon, and to which the armatureG is attached, is supported by a coiled spring, 7.:, the upper end ofwhich rests against a collar, m, secured to the tube f, while its lowerend rests upon adjusting and set nuts jj, by means of which. the degreeof compres sion of the spring may be regulated. These nuts areadjustable upon an upright hollow tube, l, which is provided with ascrew-thread upon its exterior, and is secured at its lower end to aplate on cross-bar h, (shown in bottom view, Fig. 5,) fastened by screwsto the lower end of the insulation-cylinder l5 1*]. Electricalconnection with the tube and the lower carbon for the outgoing currentis made by means of a metal block, fastened to the lower end of the tubeand provided on either side with binding-posts p j) for wires leadingfrom the lower spool, and to the out side conductors. (Sec l igs. 4cand. .3.) The lower carbon, K, is held within the tube by means of aspring, 0:, (seen in Figs. (5 and 9,) secured to the tube at its upperend, which spring is slightly rounded at its bearing end, so as to allowthetube to move up and down whenever the carbon is clamped by de vicesto be hereinafter described, but which bears against the carbon withsufficient force to cause the tube and carbon to move together underother conditions. The upper carbon, L, issupported and guided in a tubeor holder, J',.t irmly secured to metallic rod 1, bent at its upperextremity and entering a socket or boss in the side of the tube. The rodI is sup ported in the insulatingcylinder l, and is in electricalconnection with one end of the helix upon the upper spool of metal. Thisconnection is illustrated diagrammatically in Fig. 4. The rod I, as wellas the rod M, which serves also in a measure to support the tube, aswill The ran ge of be seen, passes upward within the globe instead ofupon the outside thereof, as in electric lamps of the ordinary form, inwhich the carbons are placed end to end. This not only simplifies theconstruction, but also gives a more pleasing appearance to the lamp, andwhen the globe is opalescent or of ground glass does away with the blackand well defined shadows which occur where the supports for one of thecarbons are placed outside of the globe. The improved result in thelatter particular is probably due to the diffusion of the light by thematerial of the globe itself, and the rodeo tions from one point of theinterior surface thereof to another.

The clamp and detent which controls the movement of the upper carbonconsists of a rod, 3f, similar to l, which is provided at its end with achisel-point, '10, forming a clutch or detect, and adapted to engagewith the surface of the carbon and hold it from sliding downward. Theend it plays freely in the boss or opening in the side of the'tube. The

rod M is supported in an upright lever, N, of

bone, rubber, or other insulating material, which is pivoted in a slotin the insulationcylinder E at the point r, the bracket 3 upon which thelever is pivoted being secured to the cylinderliin themanner shown. A.spring, fastened to cylinder A, bears against the le verand tends tohold the chisel-point it: againstthe upper carbon, while an adjustablescrewpin, a, passing through the lever,and adapted to bear with itsrounded or beveled point against the beveled edge ot'the armature,serves to withdraw the clutch to when the armature is raised by theaction of the supporting-spring 1.. Av sermv-stop, l3, passing throughthe cylinder A, limits the backward play of the lever. When the chiselpoint or end of rod M presses against the carbon-rod L, the latter willbe firmly held suspended in and against the sides of the hollow tube'orsocket J, notwithstanding the lower carbon, K, may be lowered orentirely removed; but when the lower carbon IIO is separated from theupper, on moving rod M to the right the slightest degree, the carbon .liwould instantly fall by gravity until the lower end was arrested by thelower carbon, or until the rod 1i again pressed its point \Y against theside of the carbon. The contact and press urc against the carbon and theremoval of said pressure and contact is brought about by the armature(ton the one hand and by the spring t on the other. The dummy spool ll,of wood, bone, or rubber, and the soft-iron spool F, as I have alreadyrcn1arl ed,are wonn d with a few layers of eomlucting-wirc, the wire onthe iron spool being, preferably, a little coarser than that on thelower or dunnny spool, so that the resistaneein the two, including thecarbons and the various connections, may be nearly equal. The circuitaround the iron spool should be of a little lcss'resistance than thecircuit through the wire on the dummy spool. The connections of thespools or heliees, the carbons, and the other devices are shown in Fig.4. The current entering at main wire 1 011 arriving at 2 branches. Theleft-hand wire passes around the iron spool and to arm or red I, carbonsL and K, tubef, collar Z, wire 3, and on to the next lamp or to earth,as the case may be. The right-ln'ind wire or circuit passes around thewooden spool and out through wire ate eolla1."/,where itjoins the mainline again. As will be seen, the circuit is divided between the twospools and formed into multiple arc, while one branch does not passthrough the carbons or are and is never broken, but simply acts as acontinuously-closed circuit, to keep the current in the main or generalcircuit closed and steady during the imperfect contacts or variations ofthe current on passing through the carbons and the lamp mechanisms. Thedunnnyspool and its bobbin may, if desired, be located in otherpositions. The position shown is chosen tor the sake of convenience andsimplicity in construction.

The action of the ironspool magnet, the armature G, and the stop-pin uand rod M with its chisel-point w, is as follows: In the normal state ofthe lamp, and when no current is acting on the iron core of the magnet,the spiral spring 7.: raises the tube], armature G, and carbon K untilthe armature comes against the hollow adjusting-nut H. In its upwardmovement the beveled edge of the armature acts upon adjustable pin 11,thus with drawing chisel-pointw of rod M from contactprcssure againstcarbon L, when the latter drops down upon the point of carbon K; This isthe position of the various parts named when the electric current isturned through the circuit. The instant this is done the two carbonsbegin to burn at their contact-points. but the are does not and cannotform until the two points of the carbons in contact are slightlyseparated. This separation is also instantly brought about by thecurrent causing the sot'tiron spool to attract the armature G, whichpulls down thctubef and carbon K. This movcmentthat is,'the downwardmove ment of the armature G brings its beveled edge away from thescrew-point a and allows the chisel-edge ot' arm M to engage and holdfast the upper carbon and prevent it from following the downwardmovement of the lower carbon. The pin a may be so adjusted that thisresult will be produced on the slight est movement of the armature G.The separation of the two points of the carbons a certain distance formsan arc of a certain kind and gives a certain tension or strength in thecurrent. The spring 7; is adjusted to this con tain tension or currentstrength, and so regulates the armatureG that is to say, this cer taintension or strength of current holds down the armature against the setstrength of the spiral spring 7., but it the current strength should beweakened, which it would if the are or the space between thecarbon-points should be increased, the spring It: lifts or raises thetube f and armature G, and thus pressing back th arm or rod M allows orcauses the upper carbon to be in to drop and so meet or approach theascending or rising carbon,when the are or space between thecarbon-points is decreased and the current is consequently increased,and so causes the armature and lower 0; rbon to descend, and again theare is regulated to the set or required strength of the current. Thisoperation is repeated as often and as regularly as the variation in thedis tance between the points oi the carbons takes place.

I have shown how the upper carbon, L, is regulated, and how the lowercarbon and its carrying-tube f is raised and lowered together; but now Iwill explain how thelower carbon. ii, is moved within thetubc,and alsodescribe the devices employed for positively locking the lower carbon ata determinate point in its downward movement with the armature, so as toprevent the formation of an arc of abnormal length and at the same timeto allow the armature to continue its downward movement without thecarbon. The top of the tube has out upon its outside surt'acea finescrew-thread, upon which nut a may be made to move up and down byturning it between the thumb and linger by its outer milled surface. Theupper edge of this nut is beveled.

On each side of the tube f and nut a are two upright spring hooks orclutches o o, mounted upon the top plate, g, of case A A. On the innersides of these clutch-hooks are two beveled surtaces, so arranged as tobe acted upon by the beveled end of nut 11 when the latter is raised bythe tubcf. The two spring hooks or clutches o 0 are so arranged as topress it rmly against the opposite sides of the carbon K, and by theirbeveled or chiseled edges or points hold the carbon firmly and preventit from moving downward; but it will be seen that owing to the peculiarbevel of their points the carbon could be moved upward notwithstandingthe pressure 01' the hooks against its sides.

It is obvious that the end of the tube might serve the t'unction ot' thenut if it were bevcded at its end; but as it is dilticult to make saidtube of precisely the proper length, I employ the adjustable nu t, whichserves the prac tical purpose. oi adjustably shortening and lengtheningthe tube. The nut n can be so set that on the upward movement of thetube f the bevel oi" the nut and that on the two hooks causes the latterto spread out and release their contact with the carbon; but on the tubef and nut a being moved downward the hooks are again brought intocontact with the ear bo'n, thus holding it tirmly.

At the top of tube located, as before explained, a tlat spring, a", witha rounded or bent end iirmly fixed to and in a slot formed at the top oftubef and pressing firmly with its rounded end against the carbon K,thus justing screw-pin '21, Fig. 2, is set so that on holding the latterfirmly in the tube. The carbon can, however, bemoved up and downnotwithstanding the pressure of the spring.

Fig. 6 is a plan of the spring-hooks, &c., looking downward upon thetopof case A A. The-two rods M and I and the carbon ii are shown insection. The two spring-clutches on hooks are shown at 0 0, while7"indieates the tube carrying the carbon, and m the upper end of thespring which presses against and holds the carbon in the tube. Theadlowering the armature G the chiseled point a: of the rod M is broughtagainst the carbon L, so as to hold the latter firmly before the twospring-clutches 0 0 come into contact with the lower carbon, so that thedescent of the upper carbon is arrested before the lower one begins tobe separated from it. The beveled nut is so adjusted that the springhooks or clamps o 0 do not clamp the carbon after the upper carbonceases its downward movement until the space between the two points ofthe carbons is sufficient for the proper development of the voltaic are,when the balance of the downward movement of the armature causes thespring a: to slide on the side-of the carbon and take a lower positionalong the side thereof. When the tubefand springm are raised again bythe action of the spring 7;, the carbon, bei ing tree to move in anupward direction between the clutches 0 o, is lifted. By thisditt'erential motion between the tube f and the carbon K the upper endof the latter is raised as it is consumed by the voltaie are. Thismovement is repeated whenever the armature is carried below the pointwhere the nut a releases the clutches and allows them to engage with thecarbon so as to stop it in its down ward movement.

Other forms of clutch may be substituted for that shown, and otherdevices moving with the armature and carbon-carrier may be our ployedforcausing the clutches to engage and disengage the carbon.

A modification of my invention, in which an armature is made to take theplace of the spring 7; and its adjuncts i'or raising the carbon and tubef, is shown in Fig. In this case the lower spool is made of soft iron,like the upper spool, and an armature, G, similar to G, is firmly fixedto the tubcf at a proper point below the spool. When the are be comesabnormal, the lower spool becomcs supcrcharged and raises the armature Gand the tube f in the same way the spring 7;. The lower spool, F, isseparated from the up per spool by a plate of non-magnetic material, 21,or, if desired, the two spools may be separated to a sutlicicnt distanceto prevent the one from affecting the other. it will be seen that thisconstruction consists simply of two spools arranged end to end, andabuting against each other, or approximately so, and having ahollow tubeor arod passing axially through them, upon each end of which is socuredan armature, the said armature being I operated conversely by the maincurrent passing ovcr the main line. This feature of my invention is notlimited to a carrier of any particular construction, butniay be employedwith carriers of other terms besides that: shown.

In order to do away with ilexible conducting-wires passing down withinthe post from the mechanism ot' the vertically-moving casing and allowthe casing to beraiscd and lowered more conveniently, I have adopted thearrangement shown in Fig. 7, which is a vertical section of thecast-iron post 1, the casing A, and insulatingtube 19, carrying the lampproper.

Two strips oi copper are represented by 23, while 2t indicatesinsulation betweecn said copper strips and the cast-iron post. Thesestrips of copper and their insulation are held by screws 25, passingthrough insulating-plugs 26, which may be held in place by applyingcement; at the blank spaces indicated at 27.. The copper strips areconnected to the two wire terminals ot" the main circuit. Two stout'tlat metallic springs, secured at their upper ends by bolts 25),passing through the tube of insulating material .l, connect with wires 1andS by the aid of screwaiuts :30. When the case is raised up to itsproperseat, the springs 28 press upon the Hat surl'aee ot' the copperstrips 23, and, making good contact, keep the circuit closed. The wires1 and pass up through the coils and lamp, and so complete the circuit inthat direction alter the manner indicated in Fig. 4-. The plates 23 maybe continued down within the post to connect with underground wires, orthey may be connected with aerial conductors brought to the top of thepost. In the latter case they need only be long enough to make metalliccontact for the springs when the lamp is elevated.

8 is a sectional view of a portion of the cast-iron post opposite thedoor in the side of said post where the attendant brings down the lampfor adjustment and renewal of the carbons or other burners.

Gontinuations of the two copper strips mentioned and shown in Fig. 7 areindicated at 2:}. A tlat plate of brass, 31, forming a switch leveri'ulcrumed or pivoted at and carrying a knob, handle, or thumb-piece ofinsulating material, 3 1., by which the lover or switch is operatet'l,is for the purpose of cutting oit' or shunting the circuit from the lampabove while the attendant is adjusting it or removing the carbons. Uponopening the door in the post the switch is turned across the copperstrips, so that the current will take the direction of the arrows. Thelamp can then be lowered and adjusted, &c., and raised again without theleast danger from the electric current. \Vhen the lamp replaced in itsproper position, the switch-lever is turned downward and parallel withthe copper strips, when the electric current can then llow through thelamp.

in my previous patent No. 268,155 the re IOU llcctor and hood on the topof the glass globe was partly fastened by a rod terminating in its lowerend in a flat head, and at its top in a screw-thread and nut to bind andhold the hood and reflector firmly to the top of the globe; but in mypresent invention the lower part of the rod terminates in a hollow tube,7, Figs. 2 and 3, trunipetshaped or flanged out at its lower end, asshown in the drawings, the projection or flange of the tube extendingunderneath the edge of the hollow in the glass or other globe, as at 8,while the space 9 between the projecting rim of the globe and the tube,as well as that shown at 13, is filled in with cement or other bindingmaterial. The tube and hood or reflector of thelamp are also furthersupported and strengthened by a plate of metal or other material, marked45, which is firmly secured to the sides of the tube and reflector orhood by soldering or otherwise, as shown at 41 andet2. The upper end oftube 7 terminates with a rod and screw-nut, 6, the connection of the rodand tube at ll being made by soldering or in any desirable manner. Thejoint and connection of the apex of the hood and the tube at 15 is alsosoldered or otherwise fastened. The tube 7 furnishes a space for theupper carbon to extend upward above the top of the globe, and thefunnelshaped mouth guides the end of the carbon on raising the case sothat should the end of the carbon not be in exact line of the hollow ofthe tube it would be directed and guided to a central position.

The rod and screw-nut may be dispensed with, and the ornamental finishor top'of the hood could be soldered at 17; but therod and screw-nutstrengthen the parts and prevent extension from corrosion or looseningof the soldering of the joints of thehood between its upper and lowerapexes.

hat I claim as my invention is- 1. The combination, with a hollowcarboncarrier, of a clamp attached thereto for sup porting the carbonand adapted to slide upon the carbon when the latter is locked againstmovement, a clutch or detent .for the carbon adapted to hold itstationary, and devices supported by the carbon-carrier which act uponsaid clutch and cause it to engage with and disengage the carbon as thecarrier is moved, substantially as and for the purpose described.

2. The combination, with a hollow carbon carrier or support, a clampingor supporting device attached to and moving with said carrier andadapted to bear against the carbon and to hold or propel or to move uponthe carbon when the same is locked against movement, a locking-clutchfixed upon a sta tionary support and arranged to normally rest againstthe carbon and lock it against movement with its carrier, and adisengaging device attached to the carrier and acting upon the clutch todisengage it from the carbon,

substantially as described.

3. The combination, with a hollow carbon carrier or support, of a springor l'riction clamp attached to said carrier and bearing against thecarbon for holding it in its tube, a lockingclamp bearing also againstthe carbon and adapted to lock it from movement in one direction only,and means attached to the carrier and acting upon the locking-clutch todisengage it from the carbon.

4-. The combination of a hollow carbon-carrier, a spring-clamp carriedthereby and bearing against the carbon or carbon-rod, a springlockingclutch adapted to prevent movement of the carbon in one direction and toallow free movement in the other, and devices attached to thecarbon-carrier arranged to release said clutch so that it may engagewith the carbon and adjustable upon their support so as to determine thepoint at which in the movement of the carrier the carbon will be lockedagainst further movement.

5. The combination of a hollow carbon-can rier and a spring-lockingclutch attached to a stationary support and adapted to engage with thecarbon, and an adjustable block or lug upon the carrier which impingesagainst the clutch as the carbon is moved up and down and removes theclutch from its locking position or allows it to lock the carbon,substantially as described.

(3. The combination of a hollow carboncarrier, an electro magnet formoving the same, a spring locking-clutch attached to a stationarysupport and adapted to engage with the carbon and hold it from movementwith its carrier in one direction, but to permit free movement intheother, and an adjustable nut upon the carrier that is brought intoand out of contactwith the clutch as the carrier moves up and down andthereby throws the clutch out of engagement with the carbon or allows itto engage therewith.

7. The combination, with the hollow carbon-carrier, of the adjustablenut encircling the carrier, and beveled upon its edge, which edgeengages with the clutch and serves as a means of shortening andlengthening said carrier.

8. The combination of the hollow carboncarrier f, provided wit-h itsclamping-spring w, theupright clutches 0 0, beveled at their sides, andthe adjustable nutn, beveled at one edge.

9. The combination of the hollow carboncarrier, the armature G, securedthereto, the clamping-spring .r, clutches 0 0, and adjust able nut 01,substantially as described.

10. The combination of hollow carbon-carrier f, armature G, attachedthereto, and ad justable hollow setscrew H, substantially as described.

11. The combination of the upper carbon in an electric lamp, a detent orclutch supported by a lever, and an armature beveled at its edge andattached to the carrier of the lower carbon, substantially as described.

12. In combination with the lower-carbon carrier of an electric lamp, aspring or sliding clamp connected to the carboacarrier, aeluteh adaptedto engage with the carbon and prevent its movement in one direction, butto allow free movement in the other, means at tached to the carrier forremoving said clutch :t'rom engagement with the lower carbon, anarmature attached to said carrier acted upon by a governingeleetroanagnet, a detent for the upper carbon, and intermediateoperating devices between the detent and the armature ot' thelower-carbon carrier, substantially as described.

13. The combination of the hollow carrier for the lower carbon, thearmature attached directly thereto and beveled at its edge, the uprightpivoted lever and detent for the up per carbon, and the adjustablebearing-pin passing through the lever and adapted to err gage with thebeveled edge of the armature.

14-. "he combination, substantially z describcd,of ahollowcarbon-carrier olnoirmag netic material, an armature attached directlythereto, and a spool of iron wound with aregulating coil or helix ot'insulated wire, and provided with a central bore or passage forsupporting and guiding the carrier.

15. In an electric lamp, the verticall, ,'-movable casing supporting theworking parts of the lamp and carrying a hollow or tubular holder ofinsulating material, within which is titted the lampanagnet, consistingoi" the spool of iron wound with insulating-wire, as and for the purposedescribed.

10. The combimition, substantially as described, ot' a tubular holder, EE, and the ver tically-arranged spools l if, having one or more enlargedor llanged heads of iron wound with coils of insulated wire in the mainor principal circuit with the light and in a derived circuit thereto.

17. The combination, substantially as described, ot' the tubular carrier19, a centrallybored spool having an enlarged or flanged head of iron, acarbon or earboircarrier passing through said spool, and an armatureattached to the carbon-carrier and arranged within the magnetic held ofthe ironspool head.

18. The combination, with a carbon carrier or support of non-magneticmaterial, of two centrally-bored spools arranged in line, havingenlarged or flanged heads and wound with coils of wire in the directcircuit with the light and in aderived circuit thereto, and anarmature-plate attached to said carrier and arranged within the magneticfield of one of the spool-heads, substantially as described.

19. The combination of casing 19, spools F 1*, earbon-carrier 1, andcross-piece h, sup porting the spring upon which the carrier rests.

20. The combination of casing 15, hollow spools 1 F earrierf,cross-piece l1, screwthreaded tube i, adjusting-nuts J, and spiralspring 7.:, substantially as described.

21. The combination of the insulating-casing E, spools F 1", providedwith a central passage for the carbon-carrier, armature G, attached tosaid carrier, verticatty-pivoted lever X, mounted within a slot in thecylinder E, and devices carried by said lever for con trolling themovement of the upper carbon.

22-. The combination, with the interior 0011- duetors leading to thelamp, of the means for exterior connections substantially as described,consisting of the insulating-plugs 26 and screws 25, passing throughopenings in the wall of the post.

23. The combination, substantially as described, 01' thevertically-movable lamp, the hollow post, the insulatedeondacting-strips, and the shunting-switch 31, located as described.

24. The combination, with. the vertically movable lamp, theinclosingpost, conducting plates or metallic contacts attached to theinterior ot' the post and connected to the outside circuit, and.eondueting-springs attached to the lamp and adapted to bear upon theconduct ing-plates when the lamp is elevated to a position tor use.

SILVANUS l1. VAN OHOATE.

Witnesses- H. C. TOWNSEND, 1I.-\RRY DEARBORX.

